JP2021032853A - Method and device for evaluating thermal history of heat resistant member - Google Patents

Abstract

To allow for simply and accurately evaluating a thermal history of a heat resistant member regardless of a configuration of an evaluation target.SOLUTION: A thermal history evaluation method provided herein comprises installing a plurality of first temperature detection members capable of detecting temperature based on property change due to thermal aging on an inspection target part specified as a heat-resistant member. A thermal history of the heat resistant member is derived based on property change of the plurality of first temperature detection members.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a heat history evaluation method for heat-resistant members and a heat history evaluation device.

In plant equipment such as boilers, coal gasifiers or waste incinerators, members such as heat transfer pipes and water wall pipes are configured as heat resistant members because they are exposed to high temperatures of several hundred degrees Celsius. In such a heat-resistant member, wall thinning may occur due to oxidation and corrosion due to high temperature, and further, sulfurization corrosion and the like, and swelling due to creep damage may occur. These events cause damage to the heat-resistant member and cause problems such as leakage of cooling water and blasting.

In order to prevent such problems, temperature sensors such as thermocouples are installed on the heat-resistant members, and the temperature is continuously monitored to study plant equipment inspection plans and renewal work. .. However, there is a limit to the number of measurement points of the temperature sensor, and continuous measurement in the fireplace over a long-term (for example, several years) periodic inspection cycle is not realistic considering the reliability of the temperature sensor itself. There wasn't. To solve such a problem, for example, in Patent Document 1, a precipitation hardening type material is built-up welded to a portion to be inspected of a heat-resistant member, and the heat history is estimated by measuring the hardness thereof. It has been proposed to simply evaluate the temperature of heat-resistant members.

Japanese Unexamined Patent Publication No. 2006-208214

In Patent Document 1, it is necessary to overlay weld a precipitation hardening type material for evaluating the hardness of the inspection target portion. However, when the heat-resistant member to be inspected has a complicated structure, it is not easy to apply a precipitation hardening type material to the inspection target portion. For example, the boiler of this type of plant equipment has a part called a tube base in which heat transfer tubes are welded to the pipes, but the pipe base has a complicated structure in which a large number of heat transfer tubes are connected.

At least one aspect of the present disclosure has been made in view of the above circumstances, and is a method for evaluating the heat history of a heat-resistant member, which can evaluate the heat history of the heat-resistant member easily and with good accuracy regardless of the configuration of the evaluation target. , It is an object to provide a heat history evaluation device.

The method for evaluating the thermal history of the heat-resistant member according to one aspect of the present disclosure is to solve the above problems.
The process of identifying the part to be inspected on the surface of the heat-resistant members that make up the plant equipment,
A process of installing a plurality of first temperature detecting members capable of detecting a temperature based on a change in properties due to thermal aging at the inspection target site, and a process of installing the plurality of first temperature detecting members.
A step of obtaining the thermal history of the heat-resistant member based on the property change of the plurality of first temperature detecting members, and a step of obtaining the thermal history of the heat-resistant member.
To be equipped.

The method for evaluating the thermal history of the heat-resistant member according to one aspect of the present disclosure is to solve the above problems.
A first temperature detection member that can detect temperature based on changes in properties due to thermal aging,
A fixing member configured to be able to be fixed to the heat-resistant member of the plant equipment while holding the first temperature detecting member.
To be equipped.

According to at least one aspect of the present disclosure, it is possible to provide a heat history evaluation method for a heat-resistant member and a heat history evaluation device capable of evaluating the heat history of the heat-resistant member easily and with good accuracy regardless of the configuration of the evaluation target. ..

It is a schematic diagram of a tube base which is an example of a heat-resistant member. It is a flowchart which shows the temperature history evaluation method of the heat-resistant member which concerns on one aspect of this disclosure for each process. It is a perspective view which shows the plurality of first temperature detection members installed on the part to be inspected. This is one of the selection examples of the temperature detection range of each temperature indicator crayon installed at the inspection target site. It is a perspective view which shows the whole structure of the heat history evaluation apparatus including the 1st temperature detection member in step S101 of FIG. It is a vertical cross-sectional view along the axial direction of the heat-resistant member of FIG. FIG. 6 is a cross-sectional view taken along the line AA of FIG. It is an enlarged view of the area D of FIG. It is a modification of FIG. It is a flowchart which shows an example of the detailed inspection method of a thermal history for each process.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the following embodiments. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention only to them, but are merely explanatory examples.

First, the heat-resistant member 1 which is an evaluation target of the thermal history evaluation method according to some aspects of the present disclosure will be described. The heat-resistant member 1 is a structure that is exposed to a high temperature during operation, and is, for example, a steam pipe that connects a boiler and a steam turbine in plant equipment such as a thermal power plant. More specifically, the heat-resistant member 1 may be the pipe pedestal shown in FIG. The pipe sill has a relatively complicated structure, in which a plurality of branch pipes 4 are connected to the pipe sill 2.

FIG. 2 is a flowchart showing the temperature history evaluation method of the heat-resistant member 1 according to one aspect of the present disclosure for each process.

In the thermal history evaluation method of this embodiment, first, the inspection target portion 6 is specified for the heat-resistant member 1 of the plant equipment to be evaluated (step S100). The inspection target portion 6 is specified with respect to a predetermined region on the surface of the heat-resistant member 1 as shown in FIG. 3 described later. Such an inspection target site 6 can be appropriately specified according to the inspection purpose. For example, when the purpose of inspection is to find a thinned part or a bulged part that causes a defect, various stresses and temperatures that directly or indirectly indicate the tendency or existence of the thinned or bulged part. Regions where the distribution of physical parameters has a particular tendency are identified. In this case, the distribution of physical parameters may be obtained from predictions and simulation results based on past results and design specifications, or from actual measurement results obtained by installing a temperature sensor or the like on the heat-resistant member to be evaluated. May be good.

Since a plurality of first temperature detecting members 8 are arranged in the inspection target portion 6 specified in step S100 in the subsequent step S101, it is possible to secure a space for installing the plurality of first temperature detecting members 8. It is preferable that the inspection target site 6 is specified so as to include a certain area. In this case, the range of the inspection target site 6 may be considered so that the temperature distribution in the inspection target site 6 falls within a certain range.

Subsequently, a plurality of first temperature detecting members 8 are installed on the inspection target portion 6 specified in step S100 (step S101). The first temperature detecting member 8 is a device capable of detecting a temperature based on a change in properties due to thermal aging. The property change used by the first temperature detecting member 8 for temperature detection is not specified, but for example, a change in resistivity, transmittance or reflectance color tone of the first temperature detecting member 8 or a phase change can be used. it can.

FIG. 3 is a perspective view showing a plurality of first temperature detecting members 8 installed on the inspection target portion 6. As shown in FIG. 3, in step S101, a plurality of first temperature detecting members 8 are installed in the inspection target portion 6. That is, when a plurality of inspection target parts 6 are specified for the heat-resistant member 1 in step S100, a plurality of first temperature detection members 8 are installed for each inspection target part 6. FIG. 3 shows a case where a plurality of first temperature detecting members 8 are evenly arranged on the surface of the inspection target portion 6 as an example of the arrangement layout of the plurality of first temperature detecting members 8 in the inspection target portion 6. ing.

The plurality of first temperature detection members 8 arranged in each inspection target portion 6 may be temperature detection devices based on the same measurement principle (in other words, using changes in the same physical parameters as property changes). In this case, by arranging the equivalent first temperature detecting member 8 in each inspection target part 6, the individual difference (for example, the difference in the manufacturing lot) of the first temperature detecting member 8 from the detection result of each first temperature detecting member 8 is obtained. It is possible to perform accurate thermal history evaluation by compensating for the variation due to the above.

Further, the plurality of first temperature detection members 8 arranged in each inspection target portion 6 may be temperature detection devices based on different measurement principles (in other words, using changes in different physical parameters as property changes). In this case, by arranging the first temperature detecting member 8 having different specifications in each inspection target portion 6, it is possible to perform the thermal history evaluation in more detail from a plurality of viewpoints.

When the installation of the plurality of first temperature detecting members 8 is completed in this way, the plant equipment is operated (step S102). Then, after the predetermined operation period has elapsed, by confirming the state of the plurality of first temperature detecting members 8, the property change of the plurality of first temperature detecting members 8 is acquired (step S103), and based on the property change. , Obtain the thermal history of the heat-resistant member 1 (step S104).

Here, a case where a temperature indicating crayon that changes the shape according to the heat history is adopted as the first temperature detecting member 8 in the above-mentioned heat history evaluation method will be specifically described as an example. The temperature indicating crayon is one of the temperature detecting members made of a crayon that melts when it reaches a predetermined temperature range. When the temperature indicating crayon is installed on the surface of the heat-resistant member 1, the temperature indicating crayon melts and changes its shape if the temperature of the surface has reached a predetermined temperature range in the past operation history. Since such a shape change of the temperature indicating crayon is irreversible, did the surface of the heat-resistant member reach a predetermined temperature range by confirming the shape change when the temperature indicating crayon was visually observed in a normal temperature environment at the time of inspection? It is possible to determine whether or not it is present and evaluate it as a thermal history.

In step S101, as shown in FIG. 3, a plurality of first temperature detecting members 8 are installed in each inspection target portion 6, but the plurality of first temperature detecting members 8 have different detection temperature ranges from each other. 1 The temperature detection member 8 may be selected to be included. That is, when a temperature indicating crayon is adopted as the first temperature detecting member, a plurality of temperature indicating crayon having different detection temperature ranges may be installed for one inspection target portion 6. In this case, the detection temperature range of each temperature indicating crayon may be selected according to the temperature range of the heat history to be evaluated. The temperature indicating crayon selection can take into account, for example, (i) the temperature detection range of each temperature indicated crayon, measurement error or individual difference, (ii) required temperature resolution, and (iii) error tolerance for the measurement result.

FIG. 4 is one of the selection examples of the temperature detection range of each temperature indicating crayon installed in the inspection target part 6. In this example, six temperature indicating crayons 8A-8F are selected to evaluate the thermal history in a given temperature range. In this selection example, the temperature detection ranges of the two temperature indicating crayon are set to overlap at each temperature. Specifically, the temperature indicating crayon 8A has a temperature detection range defined by the upper limit temperature T1 and the lower limit temperature (not shown), and the temperature indicating crayon 8B is defined by the upper limit temperature T2 (> T1) and the lower limit temperature (not shown). The temperature indicating crayon 8C has the temperature detection range defined by the upper limit temperature T4 (> T3) and the lower limit temperature T1, and the temperature indicating crayon 8D has the upper limit temperature T3 (> T2) and the lower limit temperature T2. It has a specified temperature detection range, the temperature indicator 8E has a temperature detection range defined by the upper limit temperature T6 (> T5) and the lower limit temperature T4, and the temperature indicator 8F has the upper limit temperature T5 (> T4) and the lower limit temperature. It has a temperature detection range defined by T3.

By using a plurality of temperature indicating crayon having such a temperature detection range, it is possible to evaluate as a heat history how much the maximum temperature has been reached in the past operation from the combination of the temperature indicating crayon that is in a molten state at the time of inspection. For example, when only the temperature indicating crayon 8A and 8B are in the melted state, the temperature indicating crayon 8C and 8D having a low temperature detection range to be melted next are not in the melted state, so that the maximum temperature in the past operation is the temperature indicating crayon 8D. It is specified that the temperature is equal to or less than the upper limit temperature T3 of the temperature detection range. When the temperature indicating crayon 8A, 8B, 8C, 8D are in a melted state, the temperature indicating crayon 8F, which has a low temperature detection range to be melted next, is not melted. It is specified that the temperature is T5 or less and the lower limit temperature T2 or more of the temperature indicating crayon 8D in the molten state.

Further, the temperature indicating crayon may be selected so that one temperature detection range is narrower than the other temperature detection range, such as the temperature detection range of the temperature indicator crayons 8C and 8D. That is, the temperature detection ranges of the two temperature indicating crayon may be selected so as to have an inclusive relationship. In this case, since the temperature indicating crayon having a narrow temperature detection range is melted, the maximum temperature in the thermal history can be narrowed down and specified more accurately than the case where only the temperature indicating crayon having a wide temperature detection range is used.

Further, the installation of the first temperature detection member 8 on the heat-resistant member in step S101 may be performed by using the heat history evaluation device 10 described below. 5 is a perspective view showing the overall configuration of the heat history evaluation device 10 including the first temperature detecting member 8 in step S101 of FIG. 2, and FIG. 6 is a vertical sectional view of the heat resistant member 1 of FIG. 5 along the axial direction. FIG. 7 is a cross-sectional view taken along the line AA of FIG.

The thermal history evaluation device 10 includes a fixing member 12 configured to be fixed to the heat-resistant member 1 while holding the above-mentioned first temperature detecting member 8. The fixing member 12 is configured to be attachable to the heat-resistant member 1 from the outer peripheral side of the heat-resistant member 1. The fixing member 12 is formed so as to surround the heat-resistant member 1 at least partially along the circumferential direction, for example. In this embodiment, the fixing member 12 is formed in a band shape so as to surround the heat-resistant member 1 over the entire circumference along the circumferential direction. As a result, the first temperature detecting member 8 can be fixed to the heat-resistant member 1 having a curved surface shape in a good contact state.

The fixing member 12 may be formed of, for example, a stretchable material so that the attachment position of the fixing member 12 with respect to the heat-resistant member 1 can be stably maintained. Further, since the fixing member 12 is formed of a material having excellent thermal conductivity such as metal foil, the heat between the first temperature detecting member 8 held by the fixing member 12 and the heat-resistant member 1 to be evaluated is generated. Transmission may be improved.

The fixing member 12 holds a plurality of first temperature detecting members 8. In this embodiment, the fixing member 12 is fixed so that a plurality of inspection target parts 6 are specified along the circumferential direction of the heat-resistant member 1, and the first temperature detection member 8 is installed for each inspection target part 6. Has been done. As shown in FIG. 7, each inspection target portion 6 is specified at a position of 0 degrees, 90 degrees, 180 degrees, and 270 degrees with respect to the central axis C of the heat-resistant member 1 with reference to the upper part of the paper surface. ..

Although FIGS. 5 to 7 show a case where one first temperature detecting member 8 is fixed to each inspection target portion 6, a plurality of first temperature detection members 8 are fixed to each inspection target portion 6 as described above. The member 8 may be fixed.

FIG. 8 is an enlarged view of the region D of FIG. The fixing member 12 holds at least one of the first temperature detecting members 8 outside or inside the fixing member 12. In this aspect, as shown in FIGS. 6 and 7, the fixing member 12 holds the first temperature detecting member 8 on the outside thereof. In this case, the first temperature detecting member 8 may be held by the fixing member 12 via the holding member 14. The holding member 14 includes a fixing seat 16 that comes into contact with the surface of the heat-resistant member 1 inside the fixing member 12, and the fixing seat 16 extends outward so as to penetrate the fixing member 12, and the tip thereof has a first temperature. It is configured so that it can be fitted or screwed into the recess 8a provided inside the detection member 8. Since the holding member 14 is also made of a good heat conductive material, the temperature of the heat resistant member 1 can be satisfactorily sensed by the first temperature detecting member 8.

Further, the heat history evaluation device 10 further includes a heat insulating material 18 configured to surround the first temperature detecting member 8 fixed by the fixing member 12 together with the heat resistant member 1 from the outside. As a result, the circumference of the first temperature detecting member 8 can be maintained substantially equal to the temperature of the heat-resistant member 1 to be evaluated, so that the detection accuracy of the first temperature detecting member 8 can be satisfactorily ensured. Further, by covering the first temperature detecting member 8 from the outside with the heat insulating material 18, the first temperature detecting member 8 can be protected from the outside, so that the reliability can be improved.

FIG. 9 is a modification of FIG. In this modification, the holding member 14 that holds the first temperature detecting member 8 with respect to the fixing member 12 is the first temperature detecting member 8 outside the fixing member 12 from the fixing seat 16 located inside the fixing member 12. It has a shape that penetrates the inside and spreads outside the first temperature detecting member 8. As a result, the first temperature detecting member 8 can be held more stably with respect to the fixing member 12. Further, by forming the holding member 14 from a material having good thermal conductivity, heat can be transferred to the first temperature detecting member 8 from the inside, so that the detection accuracy of the first temperature detecting member 8 can be improved. Can be done.

The heat history evaluation result by the above-mentioned heat history evaluation method may be used for a detailed inspection for carrying out a more advanced heat history evaluation. FIG. 10 is a flowchart showing an example of a detailed heat history inspection method for each process.

In the example of FIG. 10, a plurality of inspection target sites 6 are specified in the same manner as in step S100 of FIG. 2 (step S200), and the above-mentioned heat history evaluation method (see FIG. 2) is applied to these plurality of inspection target sites 6. It is carried out (step S201). Then, the priority inspection position is specified based on the evaluation result for each inspection target site 6 (step S202). The priority inspection position is an inspection position where a detailed inspection should be carried out. For example, a position where it is highly valuable to carry out a detailed inspection, such as comparing the heat history of each inspection target part 6 and having a high possibility of causing a defect. Be selected.

Subsequently, the second temperature detection member is installed at the priority inspection position specified in step S202 (step S203). The second temperature detecting member is a temperature detecting device capable of continuously measuring the temperature. That is, while the above-mentioned first temperature detecting member 8 detects the heat history relatively roughly by changing the properties, the second temperature detecting member is more detailed than the first temperature detecting member by continuously measuring the temperature. Temperature inspection can be carried out. As the second temperature detecting member, for example, a thermocouple, a radiation thermometer, an optical fiber thermometer, or the like can be adopted, but the present invention is not limited to this.

Subsequently, the plant equipment is operated with the second temperature detecting member installed at the priority inspection position (step S204), and the detection result by the second temperature detecting member is acquired and analyzed (step S205). The detection result by the second temperature detection member is acquired in real time, and the detection result may be output to the outside in real time by, for example, a wired or wireless communication means, or stored in a storage device such as a hard disk and batched at a predetermined timing. It may be output to the outside. As described above, in the detailed inspection, more detailed temperature monitoring is performed by installing the second temperature detecting member at the priority inspection position. As a result, for example, by performing detailed heat history monitoring at the priority inspection position where there is a high possibility that a defect found based on the heat history roughly evaluated by the first temperature detection member 8 will occur, the inspection plan of the plant equipment and the inspection plan of the plant equipment can be performed. The examination of renewal work can be carried out in more detail.

The detection result obtained by the second temperature detecting member can be analyzed and used by various analysis devices. For example, the heat history evaluation result by the first temperature detecting member 8 may be corrected or calibrated based on the detection result by the second temperature detecting member. In this case, the detection result by the second temperature detection member capable of continuously detecting the temperature is compared with the detection result by the first temperature detection member 8, and correction or calibration processing is performed based on the error between the two. The inspection accuracy can be improved.

In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate without departing from the spirit of the present disclosure, and the above-described embodiments may be combined as appropriate.

The contents described in each of the above embodiments are grasped as follows, for example.

(1) The method for evaluating the thermal history of the heat-resistant member according to one aspect of the present disclosure is as follows.
A step (for example, step S100 of the above embodiment) of identifying an inspection target part (for example, the inspection target part 6 of the above embodiment) on the surface of a heat-resistant member (for example, the heat-resistant member 1 of the above embodiment) constituting the plant equipment.
A step of installing a plurality of first temperature detecting members (for example, the first temperature detecting member 8 of the above embodiment) capable of detecting a temperature based on a change in properties due to thermal aging at the inspection target portion (for example, S101 of the above embodiment). )When,
A step of obtaining the thermal history of the heat-resistant member based on the property change of the plurality of first temperature detecting members (for example, steps S103 to S104 of the above embodiment).
To be equipped.

According to the aspect (1) above, a plurality of first temperature detecting members are installed on the inspection target portion. Since the first temperature detecting member can detect the temperature based on the property change due to thermal aging, by observing the property change of the first temperature detecting member, the inspection target part without continuous temperature detection. It is possible to easily evaluate the heat history in. In particular, by obtaining the thermal history based on the property change of the plurality of first temperature detecting members, highly reliable evaluation becomes possible.

(2) In another aspect, in the above aspect (1),
The plurality of first temperature detecting members include first temperature detecting members having different detection temperature ranges from each other (for example, the detection temperature ranges of the temperature indicating crayon 8A to 8F are different as shown in FIG. 4 of the above embodiment).

According to the aspect (2) above, the plurality of first temperature detecting members include first temperature detecting members having different detection temperature ranges from each other. Thereby, by observing the property change of each first temperature detecting member, the thermal history in the past operation can be evaluated more preferably.

(3) In another aspect, in the above aspect (1) or (2),
The first temperature detecting member utilizes a change in the shape, resistivity, transmittance or reflectance color tone of the first temperature detecting member, or a phase change as the property change.

According to the aspect (3) above, the thermal history can be suitably evaluated by using the first temperature detecting member that utilizes these changes in properties.

(4) In another aspect, in any one of the above (1) to (3),
A step of specifying the priority inspection position of the heat-resistant member based on the evaluation result of the heat history of the heat-resistant member by the first temperature detecting member (for example, step S202 of the above embodiment).
A step of installing a second temperature detecting member capable of continuously measuring the temperature at the priority inspection position (for example, step S203 of the above embodiment) and
A step of obtaining the thermal history of the heat-resistant member based on the detection result of the second temperature detecting member (for example, step S205 of the above embodiment).
Further prepare.

According to the aspect (4) above, the heat history evaluation by the second temperature detecting member is performed for the priority inspection position specified based on the evaluation result of the heat history by the first temperature detecting member. Since the second temperature detecting member can continuously measure the temperature, more detailed evaluation is possible as compared with the first temperature detecting member. Since the heat history evaluation by the second temperature detecting member is performed only for the priority inspection position, a large number of second temperature detecting members are installed, such as when the structure of the heat-resistant member to be evaluated is complicated. Even when it is difficult to perform or when long-term thermal history evaluation is required, highly reliable evaluation is possible with a small monitoring burden.

(5) In another aspect, in the above aspect (4),
Based on the detection result of the second temperature detection member, the evaluation result of the thermal history of the heat-resistant member by the first temperature detection member is corrected or calibrated.

According to the aspect (5) above, the detection result by the second temperature detecting member capable of continuously detecting the temperature and the detection result by the first temperature detecting member based on the property change are compared, and based on the comparison result of both. The evaluation accuracy can be improved by performing the correction or calibration process.

(6) In another aspect, in the above aspect (4) or (5),
The second temperature detecting member is a thermocouple, a radiation thermometer or an optical fiber thermometer.

According to the aspect (6) above, by using a thermocouple, a radiation thermometer or an optical fiber thermometer as the second temperature detecting member capable of continuously detecting the temperature, the thermal history at the priority inspection position can be suitably evaluated. ..

(7) In another aspect, in any one of the above (1) to (6),
The first temperature detecting member is a temperature indicating crayon (for example, the temperature indicating crayon 8A to 8F of the above embodiment).

According to the aspect (7) above, by using the temperature indicating crayon as the first temperature detecting member, the heat history at the inspection target position can be suitably evaluated.

(8) In another aspect, in any one of the above (1) to (7),
The heat-resistant member is a pipe base (for example, a pipe base shown in FIG. 1 of the above embodiment) in which a plurality of branch pipes are connected to a steam pipe connecting between a boiler of the plant equipment and a steam turbine.

According to the aspect (8) above, it is possible to easily and accurately evaluate the heat history even in a heat-resistant member having a complicated structure such as a tube base.

(9) The heat history evaluation device according to one aspect of the present disclosure is
A first temperature detecting member (for example, the first temperature detecting member 8 of the above embodiment) capable of detecting a temperature based on a change in properties due to thermal aging.
A fixing member (for example, the fixing member 12 of the above-described embodiment) configured to be fixed to the heat-resistant member of the plant equipment (for example, the heat-resistant member 1 of the above-described embodiment) while holding the first temperature detecting member.
To be equipped.

According to the aspect (9) above, the first temperature detecting member can be stably and easily fixed to the heat-resistant member to be evaluated.

(10) Another aspect is in the above-mentioned aspect (9).
The fixing member is configured to be fixed to the heat-resistant member by at least partially surrounding the heat-resistant member (for example, as shown in FIG. 7 of the above-described embodiment, the fixing member 12 surrounds the heat-resistant member 1 all around. Surrounding).

According to the aspect (10) above, the fixing member can stably fix the first temperature detecting member held by the fixing member to the heat-resistant member by surrounding the heat-resistant member at least partially.

(11) Another aspect is in the above aspect (10).
A plurality of the first temperature detecting members are configured to be holdable with respect to the fixing member (for example, a plurality of first temperature detecting members 8 are held by the fixing member 12 as shown in FIG. 7 of the above embodiment). ..

According to the aspect (11) above, by stably fixing the plurality of first temperature detecting members to the main body portion, heat with higher accuracy than when a single first temperature detecting member is used. History evaluation is possible.

(12) In another aspect, in any one of the above (9) to (11),
Further provided is a heat insulating material (for example, the heat insulating material 18 of the above embodiment) configured to surround the first temperature detecting member together with the heat resistant member from the outside.

According to the aspect (12) above, by arranging the heat insulating material so as to surround the first temperature detecting member together with the heat resistant member, the temperature at the inspection target portion can be detected more accurately by the first temperature detecting member. , Evaluation accuracy can be improved.

1 Heat-resistant member 2 Pipe gathering 4 Branch pipe 6 Inspection target part 8 First temperature detection member 10 Thermal history evaluation device 12 Fixing member 14 Holding member 16 Fixed seat 18 Heat insulating material

Claims (12)

The process of identifying the part to be inspected on the surface of the heat-resistant members that make up the plant equipment,
A process of installing a plurality of first temperature detecting members capable of detecting a temperature based on a change in properties due to thermal aging at the inspection target site, and a process of installing the plurality of first temperature detecting members.
A step of obtaining the thermal history of the heat-resistant member based on the property change of the plurality of first temperature detecting members, and a step of obtaining the thermal history of the heat-resistant member.
A method for evaluating the thermal history of heat-resistant members. The thermal history evaluation method for a heat-resistant member according to claim 1, wherein the plurality of first temperature detecting members include first temperature detecting members having different detection temperature ranges from each other. The first temperature detecting member according to claim 1 or 2, wherein the first temperature detecting member utilizes a change in the shape, resistivity, transmittance or reflectance color tone of the first temperature detecting member, or a phase change as the property change. Thermal history evaluation method for heat-resistant members. A step of specifying the priority inspection position of the heat-resistant member based on the evaluation result of the heat history of the heat-resistant member by the first temperature detection member, and
A process of installing a second temperature detection member capable of continuously measuring the temperature at the priority inspection position, and
A process of obtaining the thermal history of the heat-resistant member based on the detection result of the second temperature detecting member, and
The method for evaluating the thermal history of a heat-resistant member according to any one of claims 1 to 3, further comprising. The method for evaluating the heat history of a heat-resistant member according to claim 4, wherein the evaluation result of the heat history of the heat-resistant member by the first temperature detection member is corrected or calibrated based on the detection result of the second temperature detection member. The method for evaluating the thermal history of a heat-resistant member according to claim 4 or 5, wherein the second temperature detecting member is a thermocouple, a radiation thermometer, or an optical fiber thermometer. The method for evaluating the thermal history of a heat-resistant member according to any one of claims 1 to 6, wherein the first temperature detecting member is a temperature indicating crayon. The heat-resistant member according to any one of claims 1 to 7, wherein the heat-resistant member is a conduit in which a plurality of branch pipes are connected to a steam pipe connecting between a boiler of the plant equipment and a steam turbine. Thermal history evaluation method. A first temperature detection member that can detect temperature based on changes in properties due to thermal aging,
A fixing member configured to be able to be fixed to the heat-resistant member of the plant equipment while holding the first temperature detecting member.
A thermal history evaluation device for heat-resistant members. The thermal history evaluation device for a heat-resistant member according to claim 9, wherein the fixing member is configured to be fixed to the heat-resistant member by at least partially surrounding the heat-resistant member. The thermal history evaluation device for a heat-resistant member according to claim 10, wherein a plurality of the first temperature detecting members are configured to be able to hold the fixed member. The thermal history evaluation device for a heat-resistant member according to any one of claims 9 to 11, further comprising a heat insulating material configured to surround the first temperature detecting member together with the heat-resistant member from the outside.

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